A RW root partition is important for jailbreaks due to a need of installing unsandboxed programs and modifying system settings. Basically, root filesystem on iOS is always read-only. Therefore, remount root filesystem is a critical step in jailbreaking modern iOS. But, Apple will not allow the root filesystem to be remounted easily.

I am now working at Alibaba Inc. Before joining Alibaba, I received my Ph.D. degree in the Department of Computer Science and Technology in Tsinghua University, advised by Dr. Shi-Min Hu. I was also a visiting student of Dr. XiaoFeng Wang in Indiana University Bloomington. I am a member of Operating System Lab, Tsinghua University and System Security Lab, Indiana University.